[srslte-users] srsenb disconnection problem

[Nicola Bui]

Thanks Ishmael, Kewin,

that's not my issue: the problem happens while the phone is active, in
particular when the last is high.
I already tried increasing the inactivity timer and the error count in the
configuration file.
The stranger thing is, as soon as the phone is disconnected (I believe it
is the enb starting the disconnection) it gets a new rnti and, from the
phone perspectives, the network is visible and connected. However, nothing
works anymore like the new rnti is not linked anymore to the proper device
in the epc.
Instead, if I toggle the network from the phone, everything is resumed
properly.
I cannot send a log right now but I'll try to generate one containing the
issue and send it to you.

Best,

Nicola

On Oct 27, 2017 04:00, "Kewin Rausch" <krausch at fbk.eu> wrote:

> Hi everyone,
>
> I had a similar issue (dunno if it's really the same), and I partially
> resolved it by following Ismael answer and increasing the inactivity
> timeout period (now I set it at 60 seconds).
> Basically If i leave the UE connected to 4G but I do not generate traffic
> (for about the time the inactivity timeout value), it get disconnected by
> the eNB.
>
> This is not happening while I'm connected to a commercial base station,
> which means that something nasty is happening, and maybe paging is not
> correctly handled.
>
> I've tried the configuration with a Nexus 5, and once it get disconnected
> I need to reset everything by switching on and off the Airplane mode.
>
> Cheers,
> Kewin
>
> On Fri, Oct 27, 2017 at 8:35 AM, Ismael Gomez <ismael.gomez@
> softwareradiosystems.com> wrote:
>
>> Hi nicola, can you send us the enb.log? It is normal behavior to release
>> the connection after inactivity. You can extend the timeout in the enb.conf
>> file, expert section.
>>
>> However the UE should reconnect when paging is received when you ping it
>> for instance. If you send me the log I can check it.
>>
>> Regards
>>
>> El jue., 26 oct. 2017 17:27, Nicola Bui <n.bui at northeastern.edu>
>> escribió:
>>
>>> Dear all,
>>>
>>> I am running srsenb using oai as EPC. My mobile phone (moto g5+)
>>> connects to the network and for a while behave normally (ping is ok,
>>> surfing is ok, speedtest is fine). However, after some time everything
>>> stops working even though the phone still has an IP address the enb says
>>> the UE is attached (c-RNTI assigned properly).
>>> Actually, in the enb log I can see the c-RNTI got released and a new one
>>> got assigned to the UE, but the new connection is not working anymore. The
>>> only way for recovering the connectivity is from the mobile toggling on and
>>> off the airplane mode.
>>> The only error message I can see is: Unhandled feature in RRC function:
>>> liblte_rrc_unpck_rrc_connection_setup_complete
>>> However this appears even when the connection has been properly setup.
>>>
>>> It will be great if I can get a more stable connection or if the
>>> connection can be automatically reestablished.
>>> Any suggestion on how to debug this?
>>>
>>> Thanks,
>>> Nicola Bui
>>> Senior Research Scientist
>>> College of Computer and Information Science
>>> 655E Interdisciplinary Science and Engineering Complex
>>> Boston, MA 02115
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
>>
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